Doorcheck



Dec; 22, 1931.

A. B] CLARK DOORCHECK Filed Oct. 15, 1929 2 Sheets-Sheet l Z/ 23 if :4. x

L/ gl w Z A. B. CLARK Dec. 22, 1931.

DOORCHECK Filed Oct. 15, 1929 2 Sheets-Sheet 2 Patented Dec. 22, 1931 UNITED STATES ATEN OFFICE ANDREW B. CLARK, OF THOMASVILLE, GEORGIA, ASSIGNOR OF ONE-HALF TU MOB LUKELGFEHGMASVILLE; GEORGIA monomer:

Anemia fires W 15,. 2929. Serial nefsaam.

This invention aims to. provide novel means whereby a door will be cIosed, after it has been opened, and whereby the closing movement of. the door will he checked.

It is. within the province ofthe disclosure to improve. generally, and to enhance the utility of, devices. of that sort. to which the present invention appertains.

With the above and other objects in view, which will appearas the description proceeds, the invention resides. in the comblnation. and arrangement of parts and in the details of. construction hereinafter described and claimed, it being understood that 1- changes may he made the precise embodiment. of the device herein: disclosed, within the scope of what is claimed, without departing from the; spirit ofthe invention.

In the accompanying drawings;

Figure I shows in elevatioma device of the class. described, mountedon a door Figure 2 is a. horizontal section wherein the device claimed appears in top plan Figure 3 is an elevation showing the tank and the telescopic arm;

Figure 4 is a longitudinal section through the and. parts. therewithin,

Figure 5 is a transverse section on. an en,- larged scale on the line 55 of Figure I;

,Figure 6 is atransverse section on the line Figure 7 is a transverse section on the line ?'I of Figure 4.. r

The numeral I marks a door frame, and

the numeral 2 marks a door or other closure hinged at 3 to the frame 1 for horizontal swinging mevement- A vertical, cylindrical tank 4 is secured at 5 to the door frame 1. The tank 4 is so called because it contains oil or other lubricant that is not shown. A cylinder 6 is secured within the tank 4:. The cylinder 6 has longitudinal guide slots 7. There is a compartment 8 in the bottom of the cylinder 6. First ports 9 are located in I the lower part of the cylinder 6 and establish communication between the compartment 8 on the one hand, and the space between the cylinder 6 and the tank 4: on the other hand. In the bottom of the cylinder 6 there are second ports 10. The ports 10 establish comcompartment 8 and has a longitudinal bore 15. Thevalve casing 14 is provided with a transverse opening 16 communicating with the bore and with the compartment .8. The numeral 17 designates a; screw threaded into the outer end ofthe valve casing 14. The screw 17" may be advanced or retracted, so as to shut off the transverse opening 116, more or less, and on this account, the screw 17 constitutes a valve under the control of an operator.

A piston 18' slides in the cylinder 6, and may be provided with a paclrln-g 26, of any desired kind. The piston 18 has lateral pins or projections 19 which are received slidably in the guide slots 7 of the. cylinder 6'. The construction is such that although the piston 18 has rightline sliding movement in the cylinder 6, the piston cannot rotate in the cylinder. v H

A compression spring 20 is" in the tank l, about the cylinder 6. The upper end of the spring 26 abuts against the top of the bank 4, and the lower end of the spring abuts against the projections 19 on the. piston 18. l

A plunger 2'1, in the form: of a. screw, is mounted for rotation in the top of the tank a. The screwfil" has a helical thread 22 engaged with the piston 18. The upper end of the screw or plunger 21 is connected at 24 to a longitudinally extensible telescopic arm which is pivoted at 25 to the door" 2.

When the door 2 is opened, the telescopic arm 23 is swung horizontally, and rotation is imparted to the screw The piston moves upwardly because the plunger or screw 2i is threaded at 22 into the piston 18, and because the pins 19 and theguide I l v r 1 spiny; 20 1S compressed, because the spnng lia lllil'i'u.{hulls'lllmbllcpistn it an the upper uni the int 4.

When the piston 18 moves upwardly, as aforesaid, oil is sucked into the lower end of the cylinder 6, through the ports 9, the compartment 8 and the second ports 10. Oil, also, passes into the lower end of the cylinder through the transverse opening 16 and the bore 15 of the valve casing 14. The valve ring 11 rises and permits the oil to pass through the ports 10, as aforesaid.

When the door 2 is released, the spring 20 shoves the piston 18 downwardly and rotation is imparted to the plunger 21, because the piston 18 is threaded at 22 upon the plunger 21, the piston 18 being held for downward right line sliding movement, because the pins 19 of the piston are received slidably in the guide slots 7 of the cylinder 6.

When the plunger 21 is rotated by the downward movement of the piston 18, the arm 23 is swung horizontally, and the door 2 is closed.

\Vhen the piston 18 starts to move downwardly, the ring valve 11 moves downwardly to the position of Figure 4, and closes the ports 10. Oil can now pass out of the lower portion of the cylinder 6 only through the bore 15 of the tubular valve casing 14, and the piston 18, consequently, descends very slowly under the action of the spring 20, the closing movement of the door 2 being retarded accordingly. The speed with which the door 2 closes can be regulated by threading the screw 21 up or down, so that the transverse opening 16 in the valve casing 14 will be closed, more or less.

IV hat is claimed is:

1. A. door check and closer comprising a cylinder, a piston slidable in the cylinder, a member connected to the piston, means for connecting said member to a closure, and means for imparting sliding movement to the piston when said member is rotated by the closure, the cylinder having a compartment at its lower end, provided with an inlet and outlet, means for regulating at the will of an operator the flow from the compartment to the cylinder, the base of the cylinder having ports establishing communication between the cylinder and the compartment, and a ring valve slidable in the cylinder and controlling the ports, the base of the cylinder having an upstanding neck which engages within the ring valve to aid in centering the ring valve as the ring valve seats on the ports.

2. A door check and closer, constructed as set forth in claim 1, and further characterized by the provision of a packing on the lower end surface of the piston and having an additional function, in that it acts as a cushion engaging the ring valve, when the ring valve closes the ports in the base of the cylinder and when the piston moves down on top of the ring valve.

l.M001?clakimllcloserutilisinga l l i i r l tint, a tyillhiel' 1n the tint and hav ing longitudinal guide slots, a piston slidable in the cylinder, a member threaded into the piston, means for connecting said member to a closure to secure rotation of said member, lateral projections on the piston and extended into the tank through the guide slots, a compression spring in the tank, the projections forming an abutment for the spring and forming, also, a means for holding the piston against rotation, and means for establishing communication between the tank and the cylinder.

4:. In a door check and closer which embodies a tank, a cylinder in the tank and having its lower end in direct contact with the lower end of the tank, a piston slidable in the cylinder, means for holding the piston against rotation, a member threaded into the piston, and means for connecting said member to a closure: an improved valve mechanism which enables the lower end of the cylinder to be in direct contact with the lower end of the tank, as aforesaid, said valve mechanism comprising an automatically acting valve in the cylinder below the piston and controlling a port communicating with a compartment in the cylinder above the said lower end of the cylinder, the cylinder having a side port establishing communication between the compartment and the interior of the tank, a valve casing mounted in said lower end of the tank and mounted in the cylinder at a point above the compartment and aiding in holding said lower ends of the cylinder and the tank in direct contact, the casing having a longitudinal bore communicating with the cylinder above the compartment and below the piston, the casing having a transverse opening communicating with the compartment and the bore, and a valve under the control of an operator and located in the bore, the last-specified valve controlling the trans verse opening.

In testimony that I claim the foregoing as my own, I have hereto afliXed my signature.

ANDREW B. CLARK. 

